package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 发送验证码并保存到session中
     * @param phone
     * @param session
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 检验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误!");
        }
        // 发送验证码, 并保存验证码到redis中方便后续登录/注册校验
        String code = RandomUtil.randomNumbers(6);
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone, code
                , RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // session.setAttribute("code", code);
        log.info("发送验证码为: {}", code);
        return Result.ok();
    }

    /**
     * 用户登录/注册
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 校验手机号和验证码是否有效
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误!");
        }
        String code = loginForm.getCode();
        // 从redis中获取code校验是否一致
        String redisCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
        // Object sessionCode = session.getAttribute("code");
        if (redisCode == null || !redisCode.equals(code)) {
            return Result.fail("验证码错误");
        }
        // 根据手机号查用户是否存在
        User user = query().eq("phone", phone).one();
        // 不存在, 创建用户并保存到服务器
        if (user == null) {
            user =  createUserWithPhone(phone);
        }
        // 保存UserDTO到redis中
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        HashMap<String, String> userMap = new HashMap<>();
        userMap.put("id", String.valueOf(userDTO.getId()));
        userMap.put("nickName", userDTO.getNickName());
        userMap.put("icon", userDTO.getIcon());
        // Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
        //         CopyOptions.create()
        //                 .setIgnoreNullValue(true)
        //                 .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        String token = UUID.randomUUID().toString(true);
        String key = RedisConstants.LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(key, userMap);
        stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // session.setAttribute("user", userDTO);
        // 返回
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        // 拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        // 获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.写入Redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        // 拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        // 获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 获取本月截止今天为止的所有的签到记录, 返回的是一个十进制的数字: BITFIELD sign:5:202203 GET u14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            // 没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        // 计算连续签到了多少天
        int count = 0;
        while (true) {
            // 让这个数字与1做与运算
            if ((num & 1) == 0) {
                // 如果为0, 说明未签到
                break;
            }else {
                // 如果不为0, 说明已签到, 计数器+1
                count++;
            }
            // 把数字右移一位
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
